/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jena.atlas.io;

import static org.junit.jupiter.api.Assertions.assertEquals;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.jena.atlas.lib.Bytes;
import org.junit.jupiter.api.Test;

public class TestInputStreamBuffered {
    @Test
    public void test_01() throws IOException {
        InputStream in = stream("");
        InputStream in2 = new InputStreamBuffered(in);
        int x = count(in2);
        assertEquals(0, x);
    }

    @Test
    public void test_02() throws IOException {
        InputStream in = stream(1, 2, 3, 4);
        InputStream in2 = new InputStreamBuffered(in);
        check(in2, 1, 2, 3, 4);
    }

    @Test
    public void test_03() throws IOException {
        InputStream in = stream(1, 2, 3, 4);
        InputStream in2 = new InputStreamBuffered(in, 2);
        check(in2, 1, 2, 3, 4);
    }

    @Test
    public void test_04() throws IOException {
        InputStream in = stream(1, 2, 3, 4);
        InputStream in2 = new InputStreamBuffered(in, 1);
        check(in2, 1, 2, 3, 4);
        assertEquals(-1, in.read());
    }

    private static InputStream stream(String data) {
        byte[] b = Bytes.string2bytes(data);
        return new ByteArrayInputStream(b);
    }

    private static InputStream stream(byte...bytes) {
        return new ByteArrayInputStream(bytes);
    }

    private static InputStream stream(int...bytes) {
        return stream(ints2bytes(bytes));
    }

    // Convenience.
    private static byte[] ints2bytes(int...values) {
        byte b[] = new byte[values.length];
        for ( int i = 0 ; i < b.length ; i++ )
            b[i] = (byte)values[i];
        return b;
    }

    private static int count(InputStream in) throws IOException {
        int count = 0;
        while (in.read() != -1)
            count++;
        return count;
    }

    private static void check(InputStream in, int...bytes) throws IOException {
        check(in, ints2bytes(bytes));
    }

    private static void check(InputStream in, byte...bytes) throws IOException {
        for ( byte b : bytes ) {
            assertEquals(b, (byte)in.read());
        }
    }

}
